Blast furnace



BLAST FURNAGE Filed Jan. 19,A 1924 5 sheets-sham 1 Flc-1,1.

Nw. n 15924. 15m-776 P. O. MENKE BLAST FURNACE 'Filed Jam` 19, 1924 s sheeis-sheet 2 Patented Non., il, i924.

reni. erro Marian, or season, PENNSYLVANIA.

BLAST FURNACE.

Application led January 19, 1524. Serial No. 88133.

To all whom t may coa-cera:

Be it known that l, PAUL ,0. Mingus, residing at Sharon, in the county of'lvlercei' and State of Fennsylvaiiia, a citizen o f the United Stat-es, have invented or discovered certain new and useful lmproif'cnients in Blast Furnaces, of which ,improvements the following is a specification.

It is customary to enclose the ybrick work corresponds approximately with the innersurfaces of the cooling plates and jacket, which under the present practice are either conical, i. e., flaring from top to bottom, or cylindrical. With both forms of plates and jackets, the hot metal will, after passing below the jacket, extend horizontally beyond the jacket and cause break out which is destructive and frequently results in loss of life.

It has been found that the capacity of the furnace as at present constructed, can be greatly increased by merely7 enlarging the hearth diametrically. But any material. enlargement of the hearths of furnaces having a conical or cylindrical hearth portion is difficult on account of the position of the base plate and the pillars supporting the upper portion of the furnace to the lower end of the cooling plate and jacket.

The object of the invention described and claimed herein is to provide for a reduction of the transverse area of the body of metal as it penetrates or eats its way downwardly through the bottom of the hearth and foundation. And it is a further object of the invention to provide for a large increase in the diameter of the hearth without disturbing the pillars supporting the upper portion of the furnace or the foundation plate for such pillars. The invention is hereinafter more fully described and claimed..

In the accompanying drawings forming a part of this specification, Fig. 1 is a sectional elevation of the lower portion of a inade more or less conical. of this portion is enclosed by water cooled blast furnace as at present constructed. Fig. 2 is a view similar to Fig. l but having thed lower or heart-h portion lengibodying the improve-ment claimed herein; Fig; i sec-tional view on a plane indicated by the line lll-IIL Fig. 2; ig. e illustratespxartly in elevation and partly in section, cooling plates for the hearth; and Fig. 5 is a. sectional elevation on a plane indicated by the line V-V, Fig. 4f. f

As shown in 1, the hearth portion of a blast furnace, i. e., the portion ,of the furnace bellow the tuveres, has been and is now T11@ brick Wlulk plates l held in place by a jacket 2. Afrllhese cooling pla-.tes will maintain the briclwoi'l for a certain depth at a temperature sutii- Cendy 10W t0 Prevent fiiither penetratiennf i the metal. IOn account 0i the outward @alle from top to bottom of the water plates, the horizontal ,dimension of the body (of the metal Will iinw/21S@ as it were@ donn and in some cases when the body of metal eX- tends below the lower ends of the cooling plates it will also move outwardly and coming' into contact with the foundation rings on which the pillars supporting the upper portion of the furnace rest, will destroy or so weaken the rings that one o-r more of the pillars will drop, permitting what is known as a break out.

As will be seen by reference to Fig. l,

the lower ends of the water cooled plates and be made of a diameter equal to and less than the internal diameter of the foundation rings, while the diameter of the upper ends of the plates and jackets can be inade approximately equal to the distance between diametrically disposed pillars. While such a construction of hearth is very desirable when erecting a furnace, it is especially advantageous when it is .desired to enlarge the hearth of an old furnace.

It has been found that, in blast furnaces as heretofore constructed, ther capacity of the hearth has not been proportional to the delivery capacity of the stack and upper portion of the bosh, and that greater etticiency can be effected by increasing the diameter of the lower portion of the bosh and hearth. As the stack portion of the furnace is supported by the mantle plate 5 andpillars 4 independent of the bosh portion, such change can be readily made, but

y for reasons above stated, i. e., the employment of the conical cooling' plates and Jacket with their larger end down, an increase in the diameter of hearths, commensurate with the delivery of the stacks, could not be attained in prior constructions. But by reversing the position of the conical member, it is possible to increase the diameter of the hearth of furnaces now in use some three or four feet mo-re or less.

, By reference to Fig. 2 it will be seen that Y other parts which have been found desirable for a given size or capacity of furnace. A further advantage of the construction claimed herein is substantial freedom from bursting` of the jacket due to expansion of the salamander. rlhis is believed to be due to the fact that as the jacket is larger at its upper end, there is a possibility of upward movement of the part enclosed within the jacket, Whereas in the construction heretofore employed, there cannot be any movenient downward, but the force of expansion is exerted in radial lines.

I claim herein as my invention:

l. A blast furnace having cooling plates enclosing the hearth inclined inwardly from their upper ends.

2. A blast furnace having the port-ions below the tuyres in the form of an invertedA frustruin of a cone and cooling plates surrounding' such portion.

In testimony whereof, I have hereunto set my hand.

PAUL OTTO MENKE. 

